122 Scientific Proceedings, Royal Dublin Society. 



plentiful ; where found they were for tlie most part growing in the forks 

 of the branches or where the surface was broken and somewhat roughened 

 and cracked. 



III. Systematic List. 



The arrangement and nomenclature of the " Monogi-aph of British 

 Lichens," vols. I and II, are followed in this list. In tlie case of the 

 Lecanorei the sections into which Crombie divided that large genus 

 are indicated; and, as these are generally accepted as of generic rank, 

 some of the species are referred to under them as generic names in tlie 

 text : for instance, Lecanora {Placodium) murorum of the list is Flacodium 

 miirorum of the text. 



The list contains altogether 181 species, 13 subspecies, and 25 varieties. 

 Of these, '6 species are new to science ; 25 species, 4 subspecies, and 9 varieties 

 are new to Ireland ; and, including these, there are altogether 108 species 

 new to district L2 (Dublin and Wicklow) of Mr. Adams' biological 

 sub-division of Ireland. 



The species new to Ireland are marked with an asterisk, and those new 

 to Co. Dublin with a dagger. 



List of Species. 



Family COLLEMACEI. 



Tribe Lichinei. 



Lichina pygmaea Ag. — On rocks between neap-tide marks; general round 



the coast, mainly in the upper part of neap-range. 

 L. confinis Ag. — On rocks ; general round the coast in the upper part of the 



Verrucaria maiira belt. 



Tribe CoUemei. 



CoUema pulposum Ach. — On soil, chiefly calcareous — EarlscliSe, Glenaveena, 



White Water Brook, &c. ; frequent. 

 fC. oristatum Hoffm. — On mossy rocks and on soil, Glenaveena ; on walls, 

 Sutton ; rare. 



Family LICHENACEI. 



Tribe Sphaerophorei. 



Sphaerophorus coralloides Pars. — On mossy rooks chiefly on the east and 

 north coasts ; abundant on the headland, but not common in oui area. 



